- Not to be confused with Stamp.
Penguin Mail Stamps were stamps attached to every postcard sent through the Penguin Mail. There were seven kinds of stamps.
List of Penguin Mail Stamps[]
- 10 Coin Penguin Stamp – The most common stamp. It was almost on all of the postcards.
- 10 Coin Puffle Stamp – Seen on postcards sent by Sensei.
- 10 Coin Fire Stamp – Seen on the Card-Jitsu White Belt postcard.
- 10 Coin Water Stamp – Seen on the Card-Jitsu Black Belt postcard.
- 10 Coin Snow Stamp – Seen on the Card-Jitsu Blue Belt postcard.
- 10 Moss Key Coin Stamp – A rare stamp seen in a postcard sent by Rockhopper.
- 50 Castle Coin Stamp – Only the unreleased You're awesome! postcard had it.